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{{Built-in|Pick|⊃}} is a [[dyadic]] [[primitive function]] which performs deep [[indexing]] on a possibly [[nested array]]. Pick allows to extract a value through multiple layers of nesting in a single function application. Pick | {{Built-in|Pick|⊃}} is a [[dyadic]] [[primitive function]] which performs deep [[indexing]] on a possibly [[nested array]]. Pick allows to extract a value through multiple layers of nesting in a single function application. Pick uses the [[Right Shoe]] glyph. | ||
== Examples == | == Examples == | ||
The left [[argument]] X must be a [[vector]] where each element of X specifies the multi-dimensional [[index]] at each layer of the right argument Y. The result of < | The left [[argument]] X must be a [[scalar]] or [[vector]] where each element of X specifies the multi-dimensional [[index]] at each layer of the right argument Y. The result of <syntaxhighlight lang=apl inline>X⊃Y</syntaxhighlight> is the item of Y at the location specified by X. | ||
< | <syntaxhighlight lang=apl> | ||
⎕←G←2 3⍴('ABC' 1)('DEF' 2)('GHI' 3)('JKL' 4)('MNO' 5)('PQR' 6) | |||
┌───────┬───────┬───────┐ | ┌───────┬───────┬───────┐ | ||
│┌───┬─┐│┌───┬─┐│┌───┬─┐│ | │┌───┬─┐│┌───┬─┐│┌───┬─┐│ | ||
| Line 24: | Line 24: | ||
((2 1)1 2)⊃G | ((2 1)1 2)⊃G | ||
K | K | ||
</ | </syntaxhighlight> | ||
== See also == | |||
* [[Index (function)]] | |||
* [[Bracket indexing]] | |||
* [[Select]] | |||
== External links == | == External links == | ||
| Line 30: | Line 35: | ||
=== Documentation === | === Documentation === | ||
* [ | * [https://help.dyalog.com/latest/#Language/Primitive%20Functions/Pick.htm Dyalog] | ||
* [http://microapl.com/apl_help/ch_020_020_610.htm APLX] | * [http://microapl.com/apl_help/ch_020_020_610.htm APLX] | ||
{{APL built-ins}}[[Category:Primitive functions]] | {{APL built-ins}}[[Category:Primitive functions]] | ||